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2014-08-15T18:11:36+03:00
Cosinus=cateta alaturata/ipotenuza
cosinus de B=  AB/CB
2/5=AB/20
AB=40:5
AB=8


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  • Utilizator Brainly
2014-08-15T18:16:02+03:00
Cos B= cateta alaturata/ipotenuza= AB/ BC=AB/20....... 2/5= AB/20 → AB= 2*20/5=40/5=8cm